'Sandals' in the Bible

And the Lord said to him, 'Untie the sandals from your feet, for the place on which you are standing is holy ground.

And the angel said to him, "Gird yourself and put on your sandals!" And he did so. And he said to him, "Wrap your cloak around you and follow me!"

But while John was completing [his] mission, he said, 'What do you suppose me to be? I am not [he]! But behold, one is coming after me of whom I am not worthy to untie the sandals of [his] feet!'